2 Position Propellers Flashcards
The hydraulic counterweight propeller consists of a?
Cylinder assembly
Counterweight assembly
Hub assembly
Blade assembly
What does a Hydraulic counterweight propeller controls?
Pitch and speed
how does the Hamilton standard two position prop goes to fine pitch or Increase RPM?
uses oil pressure to rotate the blades to lower angles
how does the Hamilton standard two position prop goes to coarse pitch or lower RPM?
uses centrifugal force on the counterweights to rotate it to a higher blade angle
Why does the 2 position prop always in shut-down during coarse pitch?
Forces oil back to the sump, prevents corrosion, and provides adequate oil for the next engine start
how does the pilot controls the blade pitch?
Manually by a selector valve
why is there a 3 way valve in a 2 position prop?
permits oil pressure to flow into or drain from prop hub
what determines the minimum and maximum blade pitch?
adjustable stops in the counterweights
the centrifugal force is ____ to RPM
proportional (an increase in RPM increases the centrifugal force)
where do u use fine (low) pitch?
take-off
where do u use coarse pitch?
Cruise
Advantages of a 2 position Prop
increase engine efficiency
adjustable propeller pitch
minimizes over speed conditions
added extra power
what tool is use to measure the blade angles?
Propeller protractor
